Nodejs Array Filter filter(fn)

Method Source Code

Array.prototype.filter = function(fn){
    var self = this;
    var arr = [];
    for(var i=0; i<self.length; i++){
        if (fn(self[i])){
            arr.push(self[i]);/*  w  w w. j a  va  2  s  . c o  m*/
        }
    }
    return arr;
};

Related

1. filter(f)

   var arr = ['hello', 42, true, function() {}, "123", 3.14, 0, [1], {}];
   var isInteger = function(x) {
       return typeof x === 'number' && !isNaN(x) && x % 1 === 0;
   };
   Array.prototype.filter = function(f) {
       var newArr = [];
       for (var i = 0; i < this.length; i++) {
           if ( f(this[i]) ) {
               newArr.push(this[i]);
   ...
   

2. filter(f)

   Array.prototype.filter = Array.prototype.filter || function (f) {
     var result = [];
     this.each(function (element) {
       if (f(element, result.length)) {
         result.push(element);
     });
     return result;
   };
   ...
   

3. filter(f)

   Array.prototype.filter = function(f) {
     var filtered = [];
       for(var i = 0; i < this.length; i++)
         f(this[i], i) && filtered.push(this[i]);
       return filtered;
   };
   

4. filter(f)

   Array.prototype.filter = function(f) {
     var filter = [];
     for (var i = 0; i < this.length; i++) {
       if (f(this[i]))
         filter.push(this[i]);
     return filter;
   };
   

5. filter(filterFunc)

   Array.prototype.filter = function(filterFunc) {
     var ret = [];
     for(var i = 0; i < this.length; i++) {
       if(filterFunc(this[i])) {
         ret.push(this[i]);
     return ret;
   };
   ...
   

6. filter(fn)

   Array.prototype.filter = function(fn)
       r = [];
       this.forEach(function (item) { if (fn(item)) r.push(item); });
       return r;
   

7. filter(fn, context)

   Array.prototype.filter = function(fn, context) {
     if (typeof fn != "function") {
       throw new TypeError(fn + " is not a function");
     if (typeof context === 'undefined') {
       context = this;
     var res = [];
     for (var i = 0, l = this.length; i < l; ++i) {
   ...
   

8. filter(fun /*, thisArg */)

   "use strict";
   Array.isArray = function(arg) {
       return Object.prototype.toString.call(arg) === '[object Array]';
   };
   Array.prototype.filter = function(fun ) {
       if (this === void 0 || this === null)
           throw new TypeError();
       var t = Object(this);
       var len = t.length >>> 0;
   ...
   

9. filter(fun /*, thisp */)

   Array.prototype.filter = Array.prototype.filter || function(fun ) {
     "use strict";
     if (this === void 0 || this === null) throw new TypeError();
     var t = Object(this);
     var len = t.length >>> 0;
     if (typeof fun !== "function") throw new TypeError();
     var res = [];
     var thisp = arguments[1];
     for (var i = 0; i < len; i++) {
   ...